For all the things that you don't tell your family, you think they don't know? I tell ya they know, for sure.

They just don't bring it up to you out of respect to you knowing that you want to keep it as a secret to them but they've figured it out, trust me, maybe not all, but at least some of it. And the same thing to you, even though your brothers don't tell you everything, you really don't know what's going on with them? And I tell ya, when s*** REALLY hits the fan, your family is going to be the one who will pull through for you, things that your friends just won't be able to do. Not diminishing the value of true and real friends or anything but there are things that your friends are just NOT able to do.
You and your siblings are really keepers to each other. Once your parents are gone, you and your siblings are going to be the only ones left supporting each other; they are the only ones who TRULY know you even on a physical level without you having to say anything.